Drinking cup



FIG. 1 is a front view of a drinking cup showing my new design;

FIG. 2 is a back view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is a another side view thereof;

FIG. 5 is a perspective view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The ornamental design for a drinking cup, as shown and described.